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Thomas Berry wrote:

Apparently, Sympa 5.2.3 only allows the removal of headers as a server-wide list setting, not for individual mailing lists.

True. It would be easy to add this parameter in list config with a default inherited from sympa.conf but isn't it to much for list owners ?

But, it does appear that removing the Date header has the desired affect--the message's date header is changed to the time of distribution (Note: the archived message will still reflect the original Date: stamp).

Ok, that's normal because sendmail add a Date if ths header is missing so the effet is the one you describe.
Yes, headers are unchanged in archive. I checked the code and verify that message is archived before headers are removed. I can't figure if this is a feature aor a bug. It may be very important to archive message in a unchanged format.

If you want to change it, it is very easy to do it : edit List.pm search for the following code and move the red part after the green one. Message archived will be transformed but they will not include a date if date is removed .

  
    ## Archives
    my $msgtostore = $message->{'msg'};
    if (($message->{'smime_crypted'} eq 'smime_crypted') &&
    ($self->{admin}{archive_crypted_msg} eq 'original')) {
    $msgtostore = $message->{'orig_msg'};
    }
    $self->archive_msg($msgtostore);
   
    ## Change the reply-to header if necessary.
    if ($self->{'admin'}{'reply_to_header'}) {
      ........
    }
   
    ## Remove unwanted headers if present.
    if ($Conf{'remove_headers'}) {
        foreach my $field (@{$Conf{'remove_headers'}}) {
            $hdr->delete($field);
        }
    }

Thomas Berry wrote:

Is there a way to configure a list to replace the Date header from the time the
message was sent (from the e-mail client) to the time the message was first
distributed?

Would this be done by setting a list to remove the Date header?